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Impacts of International Research on Intertemporal Yield Stability in Wheat and Maize

An Economic Assessment

It is difficult to generate any watertight account of declines in yield variability at
the aggregate level that can be attributed to any specific research program. But
the evidence is strong nonetheless that yield variability has declined with the
diffusion of modern wheat varieties, and possibly also with maize. As reported by
previous researchers, there has factually been a decline in the variability of
national-level wheat yields and, to a lesser extent, maize yields. This decline has
been ...